Most Defining Movie of You generation?

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What would be the most defining movie of your generation and why? With me being a big horror and sci fi fan I can honestly say that Alien was the defining movie of my time. Although Aliens is my favourite all time movie, Alien was the movie that set a standard for all the rest. There has never been another movie like it, As soon as you mention Sci Fi and Horror in the same breath Alien is what we all think of. Groundbreaking special effects were used, and not just any run of themill actors. They were mostly top rated of their time. Except for Sigourney she was a nobody at the time but i dont think they could have given the lead to anyone else. It was and still is very unusual to have such quality acting in a movie of its kind and to this day if the movie came to cinemas now with no changes then I am sure it would still be a box office hit.